motion/core/time.rb in bubble-wrap-0.4.0 vs motion/core/time.rb in bubble-wrap-1.0.0.pre

@@ -1,8 +1,19 @@
 class Time
+  
   def self.iso8601(time)
-    formatter = NSDateFormatter.alloc.init
-    formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss'Z'"
-    formatter.timeZone   = NSTimeZone.timeZoneWithAbbreviation "UTC"
-    formatter.dateFromString time
+    cached_date_formatter("yyyy-MM-dd'T'HH:mm:ss'Z'").
+      dateFromString(time)
   end
+
+  private
+
+  def self.cached_date_formatter(dateFormat)
+    Thread.current[:date_formatters] ||= {}
+    Thread.current[:date_formatters][dateFormat] ||= 
+      NSDateFormatter.alloc.init.tap do |formatter|
+        formatter.dateFormat = dateFormat
+        formatter.timeZone   = NSTimeZone.timeZoneWithAbbreviation "UTC"
+      end
+  end
+
 end